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Incorrect deduction of function object types #3200

mje-nz opened this issue Oct 21, 2019 · 1 comment


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@mje-nz mje-nz commented Oct 21, 2019

cdef extern from "<functional>" namespace "std" nogil:
    cdef cppclass plus[T=*]:
        plus() except +
        T operator()(const T& lhs, const T& rhs) except +

def test(): 
    return plus[int]()(1, 2) 
test.cpp:1244:15: error: non-object type 'int (const int &, const int &)' is not assignable
    __pyx_t_1 = std::plus<int> ();
    ~~~~~~~~~ ^
1 error generated.

A temporary for std::plus<int> is generated as int __pyx_t_1(int const &, int const &), which fails to compile. Explicitly storing it in a temporary works:

def test(): 
    tmp = plus[int]()
    return tmp(1, 2) 

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@scoder scoder commented Oct 26, 2019

Seems a bug. PR welcome.

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